Improvement in burglar-alarms



W. A. PARKER.

:summa-ALARM. No.' 183,203. Patented oct.1o,1a7e.

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WILLIAM A. PARKER, OF BROOKLYN, NEW YORK, ASSIGNOR TO WILLIAM M. PARKER,OF NEW YORK CITY.

IMPROVEMENT IN BURGLAR-ALARMS.

Specification forming part of Letters Patent No. 183,203, dated October10, 1876; application filed March 31, 1876.

To all whom it may concern:

Be it known that I, WILLIAM A. PARKER, of the city ot Brooklyn, countyof Kings, and State of New York, have invented a new and usefulImprovement in Burglar-Alarms, which improvement is fully set forth inthe following speciication, reference being had to the accompanyingdrawing, in which- Figure 1 represents a sectional front view of myalarm. Fig. 2 is a transverse section of the same.

Similar letters indicate corresponding parts.

rEhis invention relates to an improvement on that class ofburglar-alarms which I have described in my Patent N o. 167,559, datedSeptember 7, 1875 5 the object of my present improvement being tosimplify the construction of my alarms, to reduce their cost, and tofacilitate the operation of applying them to doors or windows.

The alarm-releasing slide is provided with a notch in its edge, and itis subjected to the action of a single spring, which has a tendency tothrow the slide out, and which, when said slide is depressed, serves tothrow the notch in the edge of the slide in gear with the edge of theguide-slot in the case.

In the drawing, the letter A designates the bed-plate, on which issecured a spring-power alarm, B, that, when wound up and allowed to run,sounds a bell, C. The motion of this alarm can be stopped by means of alever, D, the position of which is controlled by a slide, E, which moveson the bed-plate A, being guided by a groove, a, in said bed-plate, andby a slot, b, in a plate, c, which is fastened to said plate in aposition at right angles to the same. In the edge of the slide is anotch, d, and said slide is subjected to the action of a spring, e,which has a tendency to raise the slide, and which, when the slide isdepressed, throws the notch d of the slide in gear with the edge of theguide-slot b, said spring being applied in such a position that itexerts both an upward and a lateral strain on the slide. From the faceof the slide projects a lug, h, which, when said slide is depressed,retains the lever D in a position to stop the alarm;

but when the slide is permitted to rise, the lug h releases thestop-lever D, and the alarm is free to run.

The alarm is covered by a case, F, which is secured to the bed-plate A,and in this case is a hole, to admit the thick portion of the shank of athumb-screw, G, while in the bed-plate is a hole just large enough toallow the thin portion of said shank to pass, and on this shank isformed a shoulder, m, which, when the screw is screwed up in the door orany other part, bears against the surface ot' the bedplate, and retainsthe alarm firmly in position. In the door-frame is secured a pin, i,which, when the door is closed, prevents the slide E from moving out;but when the door is opened, so that the outer end of the slide clearsthe pin i, said slide follows the action of its spring, the stop-lever Dis released, and the alarm sounds.

When it is desired to stop the alarm the slide E is depressed, so thatits notch d drops in gear with the edge of the guide-slot, where it isretained by the action of its spring e.

The position in which my alarm is to be secured to a door or window willreadily suggest itself, and requires no further explanation.

I disclaim in this application for a patent everything shown anddescribed in my Patent No. 167,559, above mentioned.

What I claim as new, and desire to secure by Letters Patent, is-

'Ihe combination, with an alarm, B, of a slide, E, having a notch, d, inits edge, a spring, e, which exerts an upward and a lateral strain onsaid slide, a slot, b, for guiding the slide, and retaining the samewhen it is depressed, a lug, It, and stop-lever D, all constructed andoperating substantially as shown and described.

In testimony that I claim the foregoing I have hereunto set my hand andseal this 24th day of March, 1876.

WM. A. PARKER. lL.

Witnesses:

W. HAUEF, E. F. KASTENHUBER.

